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<head><meta charset="utf-8"><title>I-prioritize #71550 Unsoundness due to variance of trait obj · t-compiler/wg-prioritization · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/index.html">t-compiler/wg-prioritization</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html">I-prioritize #71550 Unsoundness due to variance of trait obj</a></h3>

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<a name="195281571"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195281571" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195281571">(Apr 25 2020 at 11:52)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> issue <a href="https://github.com/rust-lang/rust/issues/71550" title="https://github.com/rust-lang/rust/issues/71550">#71550</a> has been requested for prioritization.</p>



<a name="195283179"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195283179" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195283179">(Apr 25 2020 at 12:37)</a>:</h4>
<p>This seems <code>P-high</code> to me, since (IIUC) it has been in the compiler since Rust 1.16</p>



<a name="195460523"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195460523" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195460523">(Apr 27 2020 at 18:57)</a>:</h4>
<p>about this one, I'm also in doubt if <code>P-high</code> or <code>P-critical</code></p>



<a name="195460536"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195460536" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195460536">(Apr 27 2020 at 18:57)</a>:</h4>
<p>thoughts on why one over the other one?</p>



<a name="195460578"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195460578" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195460578">(Apr 27 2020 at 18:57)</a>:</h4>
<p>It's been in the compiler for quite a long time</p>



<a name="195460601"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195460601" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195460601">(Apr 27 2020 at 18:57)</a>:</h4>
<p>I don't know if that's enough to "downgrade" to <code>P-high</code> though</p>



<a name="195462554"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195462554" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195462554">(Apr 27 2020 at 19:14)</a>:</h4>
<p>well, let's go with <code>P-high</code> I guess</p>



<a name="195463454"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195463454" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195463454">(Apr 27 2020 at 19:22)</a>:</h4>
<p>Issue <a href="https://github.com/rust-lang/rust/issues/71550" title="https://github.com/rust-lang/rust/issues/71550">#71550</a>'s prioritization request has been removed.</p>



<a name="195722084"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/195722084" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#195722084">(Apr 29 2020 at 14:56)</a>:</h4>
<p>was talking with <span class="user-mention silent" data-user-id="116009">nikomatsakis</span> about this and it seems to be more <code>P-critical</code> than <code>P-high</code> going to bump the priority of it</p>



<a name="200289773"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/200289773" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#200289773">(Jun 09 2020 at 21:00)</a>:</h4>
<p><span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> issue <a href="https://github.com/rust-lang/rust/issues/71550">#71550</a> has been requested for prioritization.</p>



<a name="200292748"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize%20%2371550%20Unsoundness%20due%20to%20variance%20of%20trait%20obj/near/200292748" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> triagebot <a href="https://rust-lang.github.io/zulip_archive/stream/227806-t-compiler/wg-prioritization/topic/I-prioritize.20.2371550.20Unsoundness.20due.20to.20variance.20of.20trait.20obj.html#200292748">(Jun 09 2020 at 21:24)</a>:</h4>
<p>Issue <a href="https://github.com/rust-lang/rust/issues/71550">#71550</a>'s prioritization request has been removed.</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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